$ git clone -n https://src.fedoraproject.org/rpms/libnbd.git /var/lib/mock/f39-build-1705858-41219/root/chroot_tmpdir/scmroot/libnbd
Cloning into '/var/lib/mock/f39-build-1705858-41219/root/chroot_tmpdir/scmroot/libnbd'...
$ git fetch origin 905c23a73d01393fda96c519cd08c064fd447cb0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libnbd
 * [new ref]         905c23a73d01393fda96c519cd08c064fd447cb0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 905c23a Fix assertion in ext-mode BLOCK_STATUS (CVE-2023-5871)